根据下列句子及所给汉语注释，写出空缺处各单词的正确形式，每空只写一词。

小题1:A shark is a dangerous 　     　 (动物) that lives in the sea.

小题2:Lin Shuhao did a good job in the basketball match last month. He is my favorite 　       (明星).

小题3:John is 　    　(幸运的) enough to be chosen for the swimming club.

小题4:It has been the 　    　 (第十) day since we climbed the Great Wall.

小题5:He borrowed my iPhone 4s and hasn’t 　     　(归还) it to me.

压缩氧自救器供气不足时，可以取下气囊呼吸。